package com.powernode.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.powernode.reggie.common.BaseContext;
import com.powernode.reggie.common.CustomException;
import com.powernode.reggie.entity.*;
import com.powernode.reggie.mapper.OrdersMapper;
import com.powernode.reggie.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * @description:
 * @author: www
 * @time: 2023/3/16 19:22
 */
@Service
public class OrdersServiceImpl extends ServiceImpl<OrdersMapper, Orders> implements OrdersService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     * @param orders
     * @return
     */
    @Override
    @Transactional
    public void submit(Orders orders) {

        //获得当前用户id
        Long currentId = BaseContext.getCurrentId();

        //查询当前用户购物车数据
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        List<ShoppingCart> shoppingCartList = shoppingCartService.list(queryWrapper);//购物车数据

        if(shoppingCartList == null || shoppingCartList.size() == 0){
            throw new CustomException("购物车为空，无法下单");
        }

        //查询用户数据  一步插入用
        User user = userService.getById(currentId);//用户数据

        //查询地址数据  下一步插入用
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);//地址数据
        if(addressBook == null){
            throw new CustomException("地址为空，请填写");
        }

        long orderId = IdWorker.getId();//生成一个订单号

        //计算总金额
        AtomicInteger amount = new AtomicInteger(0);//初始值0  原子操作，能保证线程安全问题；不会计算出错

        List<OrderDetail> orderDetails = shoppingCartList.stream().map((item)->{
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());//金额乘以份数
            return orderDetail;
        }).collect(Collectors.toList());


        //向订单表插入数据，一条数据
        orders.setNumber(String.valueOf(orderId));//订单号string传入
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(currentId);

        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        this.save(orders);

        //向订单明细表插入数据，多条
        orderDetailService.saveBatch(orderDetails);

        //购物车数据清空
        shoppingCartService.remove(queryWrapper);//根据用户id清空购物车
    }
}
